+ id
+ (if method "respooling" "going")
+ from
+ to)
+
+ ;; All except copy will need a delete
+ (gnus-registry-delete-group id from)
+
+ (when (equal 'copy action)
+ (gnus-registry-add-group id from subject sender)) ; undo the delete
+
+ (gnus-registry-add-group id to subject sender)))
+
+(defun gnus-registry-spool-action (id group &optional subject sender)
+ (let ((group (gnus-group-guess-full-name-from-command-method group)))
+ (when (and (stringp id) (string-match "\r$" id))
+ (setq id (substring id 0 -1)))
+ (gnus-message 5 "Registry: article %s spooled to %s"
+ id
+ group)
+ (gnus-registry-add-group id group subject sender)))
+
+;; Function for nn{mail|imap}-split-fancy: look up all references in
+;; the cache and if a match is found, return that group.
+(defun gnus-registry-split-fancy-with-parent ()
+ "Split this message into the same group as its parent. The parent
+is obtained from the registry. This function can be used as an entry
+in `nnmail-split-fancy' or `nnimap-split-fancy', for example like
+this: (: gnus-registry-split-fancy-with-parent)
+
+For a message to be split, it looks for the parent message in the
+References or In-Reply-To header and then looks in the registry to
+see which group that message was put in. This group is returned.
+
+See the Info node `(gnus)Fancy Mail Splitting' for more details."
+ (let ((refstr (or (message-fetch-field "references")
+ (message-fetch-field "in-reply-to")))
+ (nnmail-split-fancy-with-parent-ignore-groups
+ (if (listp nnmail-split-fancy-with-parent-ignore-groups)
+ nnmail-split-fancy-with-parent-ignore-groups
+ (list nnmail-split-fancy-with-parent-ignore-groups)))
+ references res)
+ (if refstr
+ (progn
+ (setq references (nreverse (gnus-split-references refstr)))
+ (mapcar (lambda (x)
+ (setq res (or (gnus-registry-fetch-group x) res))
+ (when (or (gnus-registry-grep-in-list
+ res
+ gnus-registry-unfollowed-groups)
+ (gnus-registry-grep-in-list
+ res
+ nnmail-split-fancy-with-parent-ignore-groups))
+ (setq res nil)))
+ references))
+
+ ;; else: there were no references, now try the extra tracking
+ (let ((sender (message-fetch-field "from"))
+ (subject (gnus-registry-simplify-subject
+ (message-fetch-field "subject")))
+ (single-match t))
+ (when (and single-match
+ (gnus-registry-track-sender-p)
+ sender)
+ (maphash
+ (lambda (key value)
+ (let ((this-sender (cdr
+ (gnus-registry-fetch-extra key 'sender))))
+ (when (and single-match
+ this-sender
+ (equal sender this-sender))
+ ;; too many matches, bail
+ (unless (equal res (gnus-registry-fetch-group key))
+ (setq single-match nil))
+ (setq res (gnus-registry-fetch-group key))
+ (gnus-message
+ ;; raise level of messaging if gnus-registry-track-extra
+ (if gnus-registry-track-extra 5 9)
+ "%s (extra tracking) traced sender %s to group %s"
+ "gnus-registry-split-fancy-with-parent"
+ sender
+ (if res res "nil")))))
+ gnus-registry-hashtb))
+ (when (and single-match
+ (gnus-registry-track-subject-p)
+ subject
+ (< gnus-registry-minimum-subject-length (length subject)))
+ (maphash
+ (lambda (key value)
+ (let ((this-subject (cdr
+ (gnus-registry-fetch-extra key 'subject))))
+ (when (and single-match
+ this-subject
+ (equal subject this-subject))
+ ;; too many matches, bail
+ (unless (equal res (gnus-registry-fetch-group key))
+ (setq single-match nil))
+ (setq res (gnus-registry-fetch-group key))
+ (gnus-message
+ ;; raise level of messaging if gnus-registry-track-extra
+ (if gnus-registry-track-extra 5 9)
+ "%s (extra tracking) traced subject %s to group %s"
+ "gnus-registry-split-fancy-with-parent"
+ subject
+ (if res res "nil")))))
+ gnus-registry-hashtb))
+ (unless single-match
+ (gnus-message
+ 5
+ "gnus-registry-split-fancy-with-parent: too many extra matches for %s"
+ refstr)
+ (setq res nil))))
+ (gnus-message
+ 5
+ "gnus-registry-split-fancy-with-parent traced %s to group %s"
+ refstr (if res res "nil"))
+
+ (when (and res gnus-registry-use-long-group-names)
+ (let ((m1 (gnus-find-method-for-group res))
+ (m2 (or gnus-command-method
+ (gnus-find-method-for-group gnus-newsgroup-name)))
+ (short-res (gnus-group-short-name res)))
+ (if (gnus-methods-equal-p m1 m2)
+ (progn
+ (gnus-message
+ 9
+ "gnus-registry-split-fancy-with-parent stripped group %s to %s"
+ res
+ short-res)
+ (setq res short-res))
+ ;; else...
+ (gnus-message
+ 5
+ "gnus-registry-split-fancy-with-parent ignored foreign group %s"
+ res)
+ (setq res nil))))
+ res))
+
+(defun gnus-registry-register-message-ids ()
+ "Register the Message-ID of every article in the group"
+ (unless (gnus-parameter-registry-ignore gnus-newsgroup-name)
+ (dolist (article gnus-newsgroup-articles)
+ (let ((id (gnus-registry-fetch-message-id-fast article)))
+ (unless (gnus-registry-fetch-group id)
+ (gnus-message 9 "Registry: Registering article %d with group %s"
+ article gnus-newsgroup-name)
+ (gnus-registry-add-group
+ (gnus-registry-fetch-message-id-fast article)
+ gnus-newsgroup-name
+ (gnus-registry-fetch-simplified-message-subject-fast article)
+ (gnus-registry-fetch-sender-fast article)))))))
+
+(defun gnus-registry-fetch-message-id-fast (article)
+ "Fetch the Message-ID quickly, using the internal gnus-data-list function"
+ (if (and (numberp article)
+ (assoc article (gnus-data-list nil)))
+ (mail-header-id (gnus-data-header (assoc article (gnus-data-list nil))))
+ nil))
+
+(defun gnus-registry-simplify-subject (subject)
+ (if (stringp subject)
+ (gnus-simplify-subject subject)
+ nil))
+
+(defun gnus-registry-fetch-simplified-message-subject-fast (article)
+ "Fetch the Subject quickly, using the internal gnus-data-list function"
+ (if (and (numberp article)
+ (assoc article (gnus-data-list nil)))
+ (gnus-registry-simplify-subject
+ (mail-header-subject (gnus-data-header
+ (assoc article (gnus-data-list nil)))))
+ nil))
+
+(defun gnus-registry-fetch-sender-fast (article)
+ "Fetch the Sender quickly, using the internal gnus-data-list function"
+ (if (and (numberp article)
+ (assoc article (gnus-data-list nil)))
+ (mail-header-from (gnus-data-header
+ (assoc article (gnus-data-list nil))))
+ nil))
+
+(defun gnus-registry-grep-in-list (word list)
+ (when word
+ (memq nil
+ (mapcar 'not
+ (mapcar
+ (lambda (x)
+ (string-match x word))
+ list)))))
+
+(defun gnus-registry-fetch-extra (id &optional entry)
+ "Get the extra data of a message, based on the message ID.
+Returns the first place where the trail finds a nonstring."
+ (let ((entry-cache (gethash entry gnus-registry-hashtb)))
+ (if (and entry
+ (hash-table-p entry-cache)
+ (gethash id entry-cache))
+ (gethash id entry-cache)
+ ;; else, if there is no caching possible...
+ (let ((trail (gethash id gnus-registry-hashtb)))
+ (when (listp trail)
+ (dolist (crumb trail)
+ (unless (stringp crumb)
+ (return (gnus-registry-fetch-extra-entry crumb entry id)))))))))
+
+(defun gnus-registry-fetch-extra-entry (alist &optional entry id)
+ "Get the extra data of a message, or a specific entry in it.
+Update the entry cache if needed."
+ (if (and entry id)
+ (let ((entry-cache (gethash entry gnus-registry-hashtb))
+ entree)
+ (when gnus-registry-entry-caching
+ ;; create the hash table
+ (unless (hash-table-p entry-cache)
+ (setq entry-cache (make-hash-table
+ :size 4096
+ :test 'equal))
+ (puthash entry entry-cache gnus-registry-hashtb))
+
+ ;; get the entree from the hash table or from the alist
+ (setq entree (gethash id entry-cache)))
+
+ (unless entree
+ (setq entree (assq entry alist))
+ (when gnus-registry-entry-caching
+ (puthash id entree entry-cache)))
+ entree)
+ alist))
+
+(defun gnus-registry-store-extra (id extra)
+ "Store the extra data of a message, based on the message ID.
+The message must have at least one group name."
+ (when (gnus-registry-group-count id)
+ ;; we now know the trail has at least 1 group name, so it's not empty
+ (let ((trail (gethash id gnus-registry-hashtb))
+ (old-extra (gnus-registry-fetch-extra id))
+ entry-cache)
+ (dolist (crumb trail)
+ (unless (stringp crumb)
+ (dolist (entry crumb)
+ (setq entry-cache (gethash (car entry) gnus-registry-hashtb))
+ (when entry-cache
+ (remhash id entry-cache))))
+ (puthash id (cons extra (delete old-extra trail))
+ gnus-registry-hashtb)
+ (setq gnus-registry-dirty t)))))
+
+(defun gnus-registry-store-extra-entry (id key value)
+ "Put a specific entry in the extras field of the registry entry for id."
+ (let* ((extra (gnus-registry-fetch-extra id))
+ (alist (cons (cons key value)
+ (gnus-assq-delete-all key (gnus-registry-fetch-extra id)))))
+ (gnus-registry-store-extra id alist)))
+
+(defun gnus-registry-fetch-group (id)
+ "Get the group of a message, based on the message ID.
+Returns the first place where the trail finds a group name."
+ (when (gnus-registry-group-count id)
+ ;; we now know the trail has at least 1 group name
+ (let ((trail (gethash id gnus-registry-hashtb)))
+ (dolist (crumb trail)
+ (when (stringp crumb)
+ (return (if gnus-registry-use-long-group-names
+ crumb
+ (gnus-group-short-name crumb))))))))
+
+(defun gnus-registry-group-count (id)
+ "Get the number of groups of a message, based on the message ID."
+ (let ((trail (gethash id gnus-registry-hashtb)))
+ (if (and trail (listp trail))
+ (apply '+ (mapcar (lambda (x) (if (stringp x) 1 0)) trail))
+ 0)))
+
+(defun gnus-registry-delete-group (id group)
+ "Delete a group for a message, based on the message ID."
+ (when group
+ (when id
+ (let ((trail (gethash id gnus-registry-hashtb))
+ (group (gnus-group-short-name group)))
+ (puthash id (if trail
+ (delete group trail)
+ nil)
+ gnus-registry-hashtb))
+ ;; now, clear the entry if there are no more groups
+ (when gnus-registry-trim-articles-without-groups
+ (unless (gnus-registry-group-count id)
+ (gnus-registry-delete-id id)))
+ (gnus-registry-store-extra-entry id 'mtime (current-time)))))
+
+(defun gnus-registry-delete-id (id)
+ "Delete a message ID from the registry."
+ (when (stringp id)
+ (remhash id gnus-registry-hashtb)
+ (maphash
+ (lambda (key value)
+ (when (hash-table-p value)
+ (remhash id value)))
+ gnus-registry-hashtb)))
+
+(defun gnus-registry-add-group (id group &optional subject sender)
+ "Add a group for a message, based on the message ID."
+ (when group
+ (when (and id
+ (not (string-match "totally-fudged-out-message-id" id)))
+ (let ((full-group group)
+ (group (if gnus-registry-use-long-group-names
+ group
+ (gnus-group-short-name group))))
+ (gnus-registry-delete-group id group)
+
+ (unless gnus-registry-use-long-group-names ;; unnecessary in this case
+ (gnus-registry-delete-group id full-group))
+
+ (let ((trail (gethash id gnus-registry-hashtb)))
+ (puthash id (if trail
+ (cons group trail)
+ (list group))
+ gnus-registry-hashtb)
+
+ (when (and (gnus-registry-track-subject-p)
+ subject)
+ (gnus-registry-store-extra-entry
+ id
+ 'subject
+ (gnus-registry-simplify-subject subject)))
+ (when (and (gnus-registry-track-sender-p)
+ sender)
+ (gnus-registry-store-extra-entry
+ id
+ 'sender
+ sender))
+
+ (gnus-registry-store-extra-entry id 'mtime (current-time)))))))
+
+(defun gnus-registry-clear ()
+ "Clear the Gnus registry."
+ (interactive)
+ (setq gnus-registry-alist nil)
+ (setq gnus-registry-hashtb (alist-to-hashtable gnus-registry-alist))
+ (setq gnus-registry-dirty t))
+
+;;;###autoload
+(defun gnus-registry-initialize ()
+ (interactive)
+ (setq gnus-registry-install t)
+ (gnus-registry-install-hooks)
+ (gnus-registry-read))
+
+;;;###autoload
+(defun gnus-registry-install-hooks ()
+ "Install the registry hooks."
+ (interactive)
+ (add-hook 'gnus-summary-article-move-hook 'gnus-registry-action)
+ (add-hook 'gnus-summary-article-delete-hook 'gnus-registry-action)
+ (add-hook 'gnus-summary-article-expire-hook 'gnus-registry-action)
+ (add-hook 'nnmail-spool-hook 'gnus-registry-spool-action)
+
+ (add-hook 'gnus-save-newsrc-hook 'gnus-registry-save)
+ (add-hook 'gnus-read-newsrc-el-hook 'gnus-registry-read)
+
+ (add-hook 'gnus-summary-prepare-hook 'gnus-registry-register-message-ids))
+
+(defun gnus-registry-unload-hook ()
+ "Uninstall the registry hooks."
+ (interactive)
+ (remove-hook 'gnus-summary-article-move-hook 'gnus-registry-action)
+ (remove-hook 'gnus-summary-article-delete-hook 'gnus-registry-action)
+ (remove-hook 'gnus-summary-article-expire-hook 'gnus-registry-action)
+ (remove-hook 'nnmail-spool-hook 'gnus-registry-spool-action)
+
+ (remove-hook 'gnus-save-newsrc-hook 'gnus-registry-save)
+ (remove-hook 'gnus-read-newsrc-el-hook 'gnus-registry-read)
+
+ (remove-hook 'gnus-summary-prepare-hook 'gnus-registry-register-message-ids))
+
+(when gnus-registry-install
+ (gnus-registry-install-hooks)
+ (gnus-registry-read))